| 摘要 |
PROBLEM TO BE SOLVED: To provide a seal for a ball screw, which can retain lubricant inside a nut, can prevent foreign matter from infiltrating into the nut and has a simple structure and a low cost.SOLUTION: A lip part 41 of a seal 4 is comprised of: a groove contact part 41a which is brought into contact with a helical groove 2a of a screw shaft 2; an outer circumferential contact part 41b which is brought into contact with an outer circumferential surface 2b of the screw shaft 2; and connection parts 41c which connect both parts 41a, 41b. The tip of the groove contact part 41a is directed to the outer side of a nut 1 in an axial direction, and the tip of the outer circumferential contact part 41b is directed to the inner side of the nut 1 in the axial direction. |
